How to declare local memory in OpenCL?

Question

I\'m running the OpenCL kernel below with a two-dimensional global work size of 1000000 x 100 and a local work size of 1 x 100.

__kernel void myKernel(
              


        

Answer 1

You could also declare your arrays like this:

__local float LP[LENGTH];

And pass the LENGTH as a define in your kernel compile.

int lp_size = 128; // this is an example; could be dynamically calculated
char compileArgs[64];
sprintf(compileArgs, "-DLENGTH=%d", lp_size);
clBuildProgram(program, 0, NULL, compileArgs, NULL, NULL);